R8C2K datasheet(156/471 Pages) RENESAS

156 / 471 page

R8C/2K Group, R8C/2L Group

16. Timers

Rev.1.10

Dec 21, 2007

Page 139 of 450

REJ09B0406-0110

16.1.1

Timer Mode

In this mode, the timer counts an internally generated count source (refer to Table 16.2 Timer Mode

Specifications).

Figure 16.4 shows the TRAIOC Register in Timer Mode.

Figure 16.4

TRAIOC Register in Timer Mode

Table 16.2

Timer Mode Specifications

Item

Specification

Count sources

f1, f2, f8, fOCO

Count operations

• Decrement

• When the timer underflows, the contents of the reload register are reloaded

and the count is continued.

Divide ratio

1/(n+1)(m+1)

n: Value set in TRAPRE register, m: Value set in TRA register

Count start condition

1 (count starts) is written to the TSTART bit in the TRACR register.

Count stop conditions

• 0 (count stops) is written to the TSTART bit in the TRACR register.

• 1 (count forcibly stops) is written to the TSTOP bit in the TRACR register.

Interrupt request

generation timing

When timer RA underflows [timer RA interrupt].

INT1/TRAIO pin

function

Programmable I/O port, or INT1 interrupt input

Read from timer

The count value can be read by reading registers TRA and TRAPRE.

Write to timer

• When registers TRAPRE and TRA are written while the count is stopped,

values are written to both the reload register and counter.

• When registers TRAPRE and TRA are written during the count, values are

written to the reload register and counter. (Refer to 16.1.1.1 Timer Write

Control during Count Operation.)

Timer RA I/O Control Register

Symbol

Address

After Reset

TRAIOC

0101h

00h

Bit Symbol

Bit Name

Function

INT1

_____

/TRAIO select bit

0 : INT1

_____

/TRAIO pin (P1_7)

1 : INT1

_____

/TRAIO pin (P1_5)

Nothing is assigned. If necessary, set to 0.

When read, the content is 0.

Reserved bit

TRAIO input filter select bits

Set to 0 in timer mode.

Set to 0.

TRAIO polarity sw itch bit

TRAIO output control bit

Set to 0 in timer mode.

—

(b7-b6)

—

TOPCR

—

(b2)

TIPF0

TIPF1

b7 b6 b5 b4 b3 b2

TIOSEL

b1 b0

TEDGSEL

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